On Darwin switch from the `VM_MEMORY_ANALYSIS_TOOL` VM tag to `VM_MEMORY_SANITIZER`

[delcypher]

Summary

On Darwin switch from the VM_MEMORY_ANALYSIS_TOOL VM tag to
VM_MEMORY_SANITIZER.

It turns out that VM_MEMORY_ANALYSIS_TOOL is already reserved for
use by other tools so switch to a tag reserved for use by the Sanitizers.

rdar://problem/41969783

[kubamracek]

Looks good, thanks!

lib/sanitizer_common/sanitizer_mac.cc

108

Drop the spaces at the beginning of the line to be consistent with the rest of the file.

[delcypher]

Update spacing as requested.

lib/sanitizer_common/sanitizer_mac.cc

 #include "sanitizer_syscall_generic.inc"
 
 // Direct syscalls, don't call libmalloc hooks (but not available on 10.6).
 extern "C" void *__mmap(void *addr, size_t len, int prot, int flags, int fildes,
                         off_t off) SANITIZER_WEAK_ATTRIBUTE;
 extern "C" int __munmap(void *, size_t) SANITIZER_WEAK_ATTRIBUTE;
 
 // ---------------------- sanitizer_libc.h
+
+// From <mach/vm_statistics.h>, but not on older OSs.
+#ifndef VM_MEMORY_SANITIZER
+#define VM_MEMORY_SANITIZER 99
+#endif
+
 uptr internal_mmap(void *addr, size_t length, int prot, int flags,
                    int fd, u64 offset) {
-  if (fd == -1) fd = VM_MAKE_TAG(VM_MEMORY_ANALYSIS_TOOL);
+  if (fd == -1) fd = VM_MAKE_TAG(VM_MEMORY_SANITIZER);
   if (&__mmap) return (uptr)__mmap(addr, length, prot, flags, fd, offset);
   return (uptr)mmap(addr, length, prot, flags, fd, offset);
 }
 
 uptr internal_munmap(void *addr, uptr length) {
   if (&__munmap) return __munmap(addr, length);
   return munmap(addr, length);
 }